Sewing machine frame



p 1933. H. F. GRUMAN SEWING MACHINE FRAME Filed Sept. 19, 1931 4 Sheets-Sheet l Sept. 26, 1933. H. F. GRUMAN SEWING MACHINE FRAME Filed Sept. 19, 1931 4 Sheets-Sheet 2 7 wmw===== tzum M i 6 l'slwentor,

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Sept. 26, 1933. ERGRUMAN 1,928,486

SEWING MACHINE FRAME Filed Sept. 19, 1931 4 Sheets-Sheet 4 wrmz glmentor,

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Patented Sept. 26, 1933 i L A SEWING MACHINE FRAME LouisQMo assignor to Lew s Invisible Stitch Machine Company, St.

Lou s, Mo., a corporation of Maine Horace F. Gruman, St.

f Original application Serial No. 512,666, January 31, 1931. Divided and this application September 19, 1931 Serial No. 563,840

3 Claims. ((31. 112-258) This invention relates to new and useful improvements in sewing machine frames of the feed-off-the-arm type, and constitutes a division of my co-pending application Serial No. 512,661,

5 filed January 31, 1931 for improvements in sewing machines.

Among the several objects of my invention are to provide a sewing machine frame of the feedoff-the-arm type wherein the standardis centrally located relative. to the overhanging arm and the front horizontal section of the work supporting arm; to provide such a frame with a standard having a forwardly and upwardly extending portion to which one end of the horizontal section of the worksupporting arm is detachably connected, whereby the operating parts in the entire work arm may be readily assembled and then attached to'the standard, and to provide such a framewith a detachable head carrying the entire rear stitch forming mechanism.

With these and other objects in view which will more fully appear, the nature of the invention will be more clearlyunderstoodby following the description, the appended claims, and the several views illustrated in the accompanying drawmgs.

In the drawings;-

Figure 1 is a perspective view of a sewing machine frame embodying 'my invention,

Figure 4 is a perspectiveview showing particu larly the attaching end of the work arm.

Figure 5 is a detail vertical sectional view showing the means for' detachably connecting the stitching head to the overhanging arm of the frame,

Figure 6'is a cross sectional view taken on the line 6-6 of Figure 5, and

Figure 7 is an elevation of the right hand side of the frame.

Like reference numerals designate corresponding parts throughout the several figures of the drawings.

As shown in the drawings, the frame embodies a hollow standard which includes an upwardly and rearwardly extending hollow portion 6 and an upwardly and forwardly extending hollow portion '7, an overhanging arm 8 which extends laterally from the upper end of the rearwardly extending portion 6 of the standard, a stitching head 9 detachably connected to the outer end of the overhanging arm 8, and a tubular work arm 10.which is detachably connected I at one end to and entirely supported by theupper end of the forwardly. extending portion 7 of the standard. The work armlO includes a front horizontal arm 11 which is disposed in parallelism with but in a plane lower than the overhanging arm and is connected at one end to the-standard as above stated, a vertical or drop arm 12 which depends from the other end of the front arm 11, and a horizontal work supporting arm 13 which is spaced from the standard and extends rearwardly from the lower end of :the vertical or drop arm 12 and has its free end terminating under the stitching head 9.. It will thus beseen that the standard is located centrally relative to the overhanging arm 8 and the front horizontal arm 11, and therefore the weight of said overhanging arm and said work arm is fairly well distributed, whereby the vibrations of the machine when the latter is operating at high speed. will be reduced .to' a minimum.

The upper part of the forwardly extending portion '7 "of the standard is provided with aright angle cut-out 14'forming an angular seat comprising a horizontal surface '15 and a vertical surface 16. The vertical surface 16 is disposed in a plane parallel with the longitudinal axis of the overhanging arm 8, and the horizontal surface extends forwardly from the bottom of the vertical surface. A perforated centering lug 17 projects downwardly from the top of the forwardly extending portion '7 and the front face of this lug lies in the plane containing the vertical face, 16. Fastening lugs 18 project inwardly from opposite sides of the forwardly extending portion '7 and have their upper'faces in the plane of the horizontal surface 15. The attaching end of the work arm 10 is provided with an arm 19 which is integral with and extends rearwardly from the front horizontal arm 11 and is shaped to form a right angle including a rear vertical surface 20 and an under horizontal surface 21 so as to fit the seat 14, with the vertical surface 20 abutting the vertical surface 16 and the horizontal surface 21 abutting or resting upon the horizontal surface 15. A perforated centering lug 22 projects downwardly from the rear end of the attaching arm 19 and the rear face of this lug lies in the plane of the vertical surface 20. The lugs 17 and 22 and the perforations thereof are disposed in registration, and a dowel pin 23 is positioned within the perforations to insure proper cooperation between the working instrumentalities in the work arm section 12 and the work instrumentalities mounted on the detachable head 9. Fastening lugs 24 project inwardly from opposite sides of the attaching arm 19 and have their lower faces in the plane of the horizontal surface 21. The fastening lugs 18 and 24 are disposed in registration and are held against movement by fastening screws 25. Thus it will be seen that the work arm 10 is detachably connected to the standard, and that said detachable connection forms the sole supporting means for the work arm. 7

The outer end of the overhanging arm 8 is closed by a vertical wall 26, and the inner end of the stitching head 9 is closed by a vertical wall 27 which abuts the wall 26. A main rotary shaft 28 is journaled in the overhanging arm 8 and the driven end thereof projects through a bearing 29 into the head 9, the bearing 29 being rigidly connected to the wall 27 of the head, as by threaded engagement, and projecting outwardly from said wall into an opening 30 formed in the wall 26 of the overhanging arm. Dowel pins 31, 31 are fixedly connected to the wall 27 of the head on opposite sides of the bearing 29 and extend outwardly into openings 32, 32 formed in the wall 26 of the overhanging arm. Set screws 33, 33 are threaded into openings formed in the wall 26 and the inner ends 34, 34 of said screws are tapered and engage in transverse openings 31 31 formed in the dowel pins 31, 31, and thereby not only draw the wall 27 of the head 9 tightly against the wall 26 of the overhanging arm but also maintain said head against turning movement about the shaft 28.

It is of course to be understood that the details of structure and arrangements of parts may be variously changed and modified without departing from the spirit and scope of my invention.

I claim:-- 7

1. A sewing machine frame comprising a hollow standard having a forwardly extending portion, an overhanging arm extending laterally from the upper end of the standard, the upper part of the forward end of the forwardly extending portion of the standard being formed with an angular seat including a substantially vertical surface extending in a plane substantially parallel to the plane of the overhanging arm and a substantially horizontal surface extending forwardly from the bottom of the vertical surface, and a tubular work arm having its free end disposed under the overhanging arm and having its other end shaped to fit said seat and detachably connected thereto.

2. A sewing machine frame comprising a hollow standard having a forwardly extending portion, an overhanging arm extending laterally from the upper end of the standard, the upper part of the forward end of the forwardly extending portion of the standard being formed with an angular seat including a substantially vertical surface extending in a plane substantially parallel to the plane of the overhanging arm and a substantially horizontal surface extending forwardly from the bottom of the vertical surface, and a tubular work arm having its free end disposed under the overhanging arm and having a rearwardly extending attaching arm having an under horizontal surface seated on the horizontal surface of the angular seat and having a rear vertical surface abutting the vertical surface of the seat, and means detachably connecting the attaching arm to the standard.

3. A sewing machine comprising a standard having a work support and a tubular overhanging arm element having a'closing wall at its outer end, a stitching head element having a closing wall at its inner end, and means for detachably connecting the arm and head comprising a dowel pin fixed to one wall and extending into a corresponding opening in the other wall and formed with a transverse opening, and a set screw having threaded engagement with the element to whichthe dowel pin is fixed and having a tapered end seated in the transverse opening of the dowel pin to draw said elements together.

HORACE F. GRUMAN. 

